SX phœnicis stars in the core of 47 Tucanae

H. Bruntt, S. Frandsen, Ronald Lynn Gilliland, J. Christensen-Dalsgaard, J. O. Petersen, P. Guhathakurta, P. D. Edmonds, G. Bono

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We present new results on five of six known SX Phœnics stars in the core of the globular cluster 47 Tucanae. We give interpretations of the light curves in the V and I bands from 8.3 days of observations with the Hubble Space Telescope near the core of 47 Tuc. The most evolved SX Phe star in the cluster is a double-mode pulsator (V2) and we determine its mass to be (1.54 ± 0.05) M⊙ from its position in the Hertzsprung-Russell diagram and by comparing observed periods with current theoretical pulsation models. For V14 we do not detect any pulsation signal. For the double-mode pulsators V3, V15, and V16 we cannot give a safe identification of the modes. We also describe the photometric techniques we have used to extract the light curves of stars in the crowded core. Some of the SX Phoenicis are saturated and we demonstrate that even for stars that show signs of a bleeding signal we can obtain a point-to-point accuracy of 1-3%.

Original languageEnglish (US)
Pages (from-to)614-625
Number of pages12
JournalAstronomy and Astrophysics
Volume371
Issue number2
DOIs
StatePublished - Jan 1 2001

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stars
light curve
diagram
Hertzsprung-Russell diagram
bleeding
extremely high frequencies
globular clusters
Hubble Space Telescope

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bruntt, H., Frandsen, S., Gilliland, R. L., Christensen-Dalsgaard, J., Petersen, J. O., Guhathakurta, P., ... Bono, G. (2001). SX phœnicis stars in the core of 47 Tucanae. Astronomy and Astrophysics, 371(2), 614-625. https://doi.org/10.1051/0004-6361:20010369
Bruntt, H. ; Frandsen, S. ; Gilliland, Ronald Lynn ; Christensen-Dalsgaard, J. ; Petersen, J. O. ; Guhathakurta, P. ; Edmonds, P. D. ; Bono, G. / SX phœnicis stars in the core of 47 Tucanae. In: Astronomy and Astrophysics. 2001 ; Vol. 371, No. 2. pp. 614-625.
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Bruntt, H, Frandsen, S, Gilliland, RL, Christensen-Dalsgaard, J, Petersen, JO, Guhathakurta, P, Edmonds, PD & Bono, G 2001, 'SX phœnicis stars in the core of 47 Tucanae', Astronomy and Astrophysics, vol. 371, no. 2, pp. 614-625. https://doi.org/10.1051/0004-6361:20010369

SX phœnicis stars in the core of 47 Tucanae. / Bruntt, H.; Frandsen, S.; Gilliland, Ronald Lynn; Christensen-Dalsgaard, J.; Petersen, J. O.; Guhathakurta, P.; Edmonds, P. D.; Bono, G.

In: Astronomy and Astrophysics, Vol. 371, No. 2, 01.01.2001, p. 614-625.

Research output: Contribution to journalArticle

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AU - Bono, G.

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N2 - We present new results on five of six known SX Phœnics stars in the core of the globular cluster 47 Tucanae. We give interpretations of the light curves in the V and I bands from 8.3 days of observations with the Hubble Space Telescope near the core of 47 Tuc. The most evolved SX Phe star in the cluster is a double-mode pulsator (V2) and we determine its mass to be (1.54 ± 0.05) M⊙ from its position in the Hertzsprung-Russell diagram and by comparing observed periods with current theoretical pulsation models. For V14 we do not detect any pulsation signal. For the double-mode pulsators V3, V15, and V16 we cannot give a safe identification of the modes. We also describe the photometric techniques we have used to extract the light curves of stars in the crowded core. Some of the SX Phoenicis are saturated and we demonstrate that even for stars that show signs of a bleeding signal we can obtain a point-to-point accuracy of 1-3%.

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Bruntt H, Frandsen S, Gilliland RL, Christensen-Dalsgaard J, Petersen JO, Guhathakurta P et al. SX phœnicis stars in the core of 47 Tucanae. Astronomy and Astrophysics. 2001 Jan 1;371(2):614-625. https://doi.org/10.1051/0004-6361:20010369